<!DOCTYPE html>
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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
         //数据类型转换
         //把一个Number转换为字符串
         var tmp1=100;
         console.log(typeof tmp1);
         //转换方式一
         var tmp2=tmp1.toString();
         console.log(typeof tmp2);

         //转换方式二
         var tmp3=String(tmp1);
         console.log(typeof tmp3);

         //转换方式三
         var tmp4=tmp1+" ";
         console.log(tmp4);
         
         console.log(typeof tmp4);
    </script>
</head>
<body>
    
</body>
</html>